Title:
EXHAUST GAS PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2013/146462
Kind Code:
A1
Abstract:
An exhaust gas purification system, in which a NOx purification catalyst is capable of functioning across the entire operating range of an internal combustion engine, is provided. The exhaust gas purification system (1) of the internal combustion engine (10) is provided with: an upstream NOx purification catalyst (25) that is positioned on an exhaust passage (14) of the internal combustion engine (10), and purifies NOx in exhaust gas; a downstream NOx purification catalyst (26) that is positioned on the exhaust passage further downstream than the upstream NOx purification catalyst (25), and has a higher NOx purification rate than the downstream NOx purification catalyst (25) in a high-temperature region; an exhaust gas cooling device (40) that is disposed on the exhaust passage (14) between the upstream NOx purification catalyst (25) and the downstream NOx purification catalyst (26), and cools exhaust gas; an exhaust temperature detection means (34) that detects the temperature of exhaust gas that flows into the downstream NOx purification catalyst (26); and a control means (35) that activates the exhaust gas cooling device (40) when the value detected by the exhaust temperature detection means (34) exceeds a threshold value.
Inventors:
NAGAOKA DAIJI (JP)
NAKADA TERUO (JP)
NAKADA TERUO (JP)
Application Number:
PCT/JP2013/057800
Publication Date:
October 03, 2013
Filing Date:
March 19, 2013
Export Citation:
Assignee:
ISUZU MOTORS LTD (JP)
International Classes:
F01N3/24; F01N3/08; F01N3/20; F02D45/00
Foreign References:
| JPH11343834A | 1999-12-14 | |||
| JP2009097469A | 2009-05-07 | |||
| JP2010174645A | 2010-08-12 | |||
| JPH0598957A | 1993-04-20 |
Attorney, Agent or Firm:
KINUTANI Nobuo (JP)
Nobuo Kinutani (JP)
Nobuo Kinutani (JP)
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